286results about How to "Reduce the difficulty of measurement" patented technology

The present invention relates to the technical field of electrical engineering and discloses a PRBS disturbance injection-based power grid impedance online identification device. The device is mainly composed of a grid-connected inverter, a current loop controller, a sampling device and an impedance identification unit. The device is characterized in that the grid-connected inverter is connected with the current loop controller. When the grid-connected state is stable, the grid-connected inverter injects the PRBS disturbance into the power grid. During the injection process of a PRBS signal, a built-in output voltage THD is fed back to the controller, so that the THD value of the output voltage of the inverter is ensured to be smaller than 5%. The sampling device is connected with the PCC part of the power grid and is used for sampling and recording the voltage and the current at the PCC part of the power grid. The impedance identification unit is used for subjecting the sampled data of the sampling device to DFT analysis, and taking the average value of the amplitude and the average value of the phase of each harmonic component of the voltage and the current during the current sampling period. The method of the invention is high in precision, high in speed, strong in real-time property, wide in frequency range, lower in measuring cost and difficulty, and better in stability.

The invention discloses a measuring method of high-temperature oil-water relative permeability of a heavy oil reservoir. A method for replacing high-temperature oil-water relative permeability of the heavy oil reservoir with oil-water relative permeability under the low-temperature oil-water system condition is put forward for the first time, reduces the measuring difficulty of the high-temperature oil-water permeability of the heavy oil reservoir, avoids potential safety hazards caused by high-temperature and high-pressure experiment conditions and simplifies experiment processes and operation requirements, and the oil-water relative permeability obtained with the two measuring methods is basically identical on the premise that the oil-water viscosity ratio is equal, thus, simple, time-saving, safe and accurate measurement of the high-temperature heavy oil relative permeability is realized with the method.

Embodiments of the present invention provide an indoor multipath error determining method and apparatus. The method comprises the steps of acquiring a to-be-positioned region covered by multiple base stations; dividing the to-be-positioned region into multiple preset grids; determining grid tops of each grid of the multiple preset grids as multiple reference points; measuring TOA Measure at when a signal of each base station of the multiple base stations arrives at the multiple reference points; for each reference point among the multiple reference points, comparing the TOA Measure with preset ideal TOA at when the signal of each base station arrives at each reference point, so as to obtain a multipath error of signal transmission between each reference point and each base station; and according to the multipath error of each reference point and pre-acquired position information of the multiple reference points, using a interpolation algorithm to obtain multipath errors of all points achieving the preset distance accuracy in the to-be-positioned region, wherein the preset distance accuracy specifically refers to a distance between every two points of all the points in the to-be-positioned region.

The invention discloses a VFTO (very fast transient overvoltage) measurement method and system, relating to the technical field of overvoltage protection of a power system. The high-frequency component of VFTO is measured by high-resolution continuous sampling, the power-frequency component in the low-frequency component of VFTO is measured by low-resolution single sampling, and the measured data of the high-frequency component and low-frequency component of VFTO is synthesized into a VFTO full waveform. Through the VFTO measurement method and system disclosed by the invention, the high-frequency component and low-frequency component of VFTO are separately measured, and the measured results are synthesized into a full-waveform VFTO, thus the difficulty of VFTO measurement and the requirement for the storage capacity for storing the measured results are reduced, and the accuracy of VFTO measurement is improved.

The invention relates to a network environment-oriented electroencephalogram identification system and a network environment-oriented electroencephalogram identification method. The identification system comprises a plurality of wearable electroencephalogram measuring devices, more than one mobile network terminal and an electroencephalogram data processing device; the electroencephalogram measuring devices are used for processing measured electroencephalograms into network electroencephalogram data and transmitting the network electroencephalogram data to the electroencephalogram data processing device for processing; the electroencephalogram data processing device is used for outputting an identification result and transmitting the identification result to a mobile network terminal for displaying. The identification method comprises the steps of measuring the electroencephalograms of a tested individual by using the electroencephalogram measuring devices and processing the electroencephalograms into the network electroencephalogram data, transmitting the electroencephalogram data to the electroencephalogram data processing device by virtue of a wireless network card of the mobile network terminal, performing segment treatment on the electroencephalograms and extracting electroencephalogram characteristic information by use of the electroencephalogram data processing device, screening electroencephalogram characteristic vector training samples based on reputation computing, and determining the input sample and the degree of membership of a fuzzy support vector machine, thereby completing the identification of the tested individual and outputting the result.

The invention discloses a single-monochrome-CCD phase shift dual-wavelength interferometry method based on a specific phase shift amount. The method includes the steps that first, a common-path coaxial dual-wavelength interference system is constructed, the laser with the wavelength of lambda1 and the laser with the wavelength of lambda2 are made to enter the interference system, and the lasers with the two wavelengths are adjusted to form interference patterns along a totally same path; second, a single monochrome CCD is adjusted to collect parameters of the dual-wavelength interference patterns; third, the dual-wavelength phase shift interference patterns generated by the two wavelengths at the same time are collected by the single monochrome CCD; fourth, two single-wavelength phase shift interference signal patterns with the background eliminated are separated from the collected dual-wavelength phase shift interference patterns; fifth, normalization processing is performed on the two separated single-wavelength phase shift interference signal patterns; sixth, single-wavelength wrapped phase graphs at the wavelength of lambda1 and the wavelength of lambda2 are calculated; seventh, synthetic wavelength phases with the wavelength of lambda1 and the wavelength of lambda2 are calculated, and thus three-dimensional morphology information of the surface of an object to be measured is obtained. The method is simple and easy to perform.

The invention discloses an expandable multi-user-set quantum key sharing method. An original holder Alice of a quantum key and sharing users determine that an m-particle GHZ state represents 0, a m-particle W state represents 1, and each particle represents a sharing user. The Alice expands m key-sharing users into m key-sharing user sets as needed and forms a new GHZ state or W state by introducing auxiliary particles. The Alice prepares p corresponding GHZ states or W states according to a key length, extracts one particle from the same position in each GHZ state or W state to form a p-length particle sequence and send the sequence to all users for safety authentication. As long as there is one user in each sharing user set in coordination with all other users in the sharing user sets, an initial key can be restored. The method improves the stability and flexibility of a protocol, reduces the consumption of classic information transmission, and reduces the measurement difficulty andthe equipment requirement of a client.

The invention relates to a disordered high capacity multiparty quantum key agreement method based on a high energy level bell state, which is designed for providing a more flexible and efficient quantum key sharing mode. The method provided by the invention comprises the following steps: dividing an initial bell state into two particle sequences Si, 1 and Si, 2, inserting a bait single photon sequence into the particle sequence Si, 2, forming a transmission sequence (represented as a formula in specification) and then sending the transmission sequence to the next user (represented as a formulain specification) to confirm security, and then performing d-dimension unitary operation for the particle sequence according to content of owned key sequence (represented as a formula in specification), inserting the bait single photon sequence in an operation result, sending the result to the next user (represented as a formula in specification), and repeating the steps above to perform security detection and message coding by the users (represented as a formula in specification). When the user Pi receives the particle sequence S1, 2 sent out by itself, after confirming security, the user Pi performs the d-dimension unitary operation for the particle sequence. The user Pi performs two qudit unitary operations for the finally recycled d-energy level bell state, and respectively performssingle particle measurement based on a base H and a base Z for a first particle and a second particle of the bell state.

The invention discloses a method for measuring the energizing force of an engine based on vibration response, and relates to the fields of motive power machines and signal processing. The method comprises an exciting force measure equation and a continuous refinement analytical Fourier transform method. In the method, a panorama spectrum is made for a vibrating acceleration signal on the surface or a suspension point of an engine cylinder body, the real energizing frequency f, amplitude and phase information of the engine in a vibration displacement frequency spectrum are obtained accurately in energizing frequency intervals of the engine in the panorama spectrum by adopting Fourier transform (FT) refinement operation, an accurate value of a vibration displacement vector in the exciting force measure equation is solved, and the energizing force F(f) is calculated by combining other known engine parameters. The method of the invention can solve the problem that complicated nonlinear equations are needed to be solved due to the deficiency of accurate phase information in the process of measuring the energizing force of the engine.

The invention relates to an in-situ measurement method for radial run-out of a grinding wheel, and an in-situ measurement device for radial run-out of the grinding wheel. According to the in-situ measurement method and device for radial run-out of the grinding wheel, the radial run-out of the grinding wheel and the phase angle of radial run-out on the circumference of the grinding wheel are measured at the same time, and therefore run-out of different positions on the surface of the grinding wheel can be conveniently and accurately analyzed; and furthermore, in-situ measurement is achieved, positioning deviation caused by disassembling and assembling of the grinding wheel is avoided, and precise in-situ measurement of radial run-out of the grinding wheel is efficiently achieved. By means of the lever principle, the radial run-out change of the grinding wheel is converted into rotation displacement of a lever through a contact head and detected by a displacement sensor, the distance between a measurement point of the displacement sensor and the starting end of the lever is larger than the distance between the contact head and the displacement sensor, and therefore radial run-out of the grinding wheel is measured after being amplified, the measurement difficulty is lowered, and precise in-situ detection of trace radial run-out of the precise grinding wheel is achieved.

The invention provides a workpiece multi-dimension multi-parameter measuring method based on image processing. Multi-dimension multi-parameter measurement of a to-be-measured object is realized at a measuring platform. The platform is formed by processing software, a scanner, a camera, a linear motor, and a motion slide rail etc. Before a batch of workpieces are measured, required parameters are input through control software and compared with preset thresholds, and different processing modules are started according to characteristics of measuring parameters. After the selection of a solution, the position of a to-be-measured area is estimated through shooting of the camera and the parameters preset by the software, the scanner is driven to scan the workpieces by the linear motor through the slide rail, and the absolute value of each parameter is calculated after obtaining of point cloud data. According to the method, the general measuring platform is established, the cost and the measuring time are reduced, and the precision requirement of measurement is met.

Provided is a measurement method for the effective extraction radius of a drill hole. Firstly, the drill hole perpendicular to a coal bed is formed, and the original gas pressure of the coal bed is measured. Secondly, four extraction drill holes perpendicular to the coal bed are formed around the drill hole according to the sequence from the near point to the far point, and connection extraction is performed immediately after the construction is completed. Meanwhile, the drill hole is filled with SF6 gas through a pressure gauge switch outside the pressure measurement drill hole, it is guaranteed that the gas pressure in the drill hole is the original gas pressure of the coal bed, and measurement conditions of a radial steady flow field are created. The time for observing the SF6 at different interval conditions of the extraction observation hole and a gas filling hole is recorded, and expansion ranges of different gas flow fields and the corresponding time are determined. The effective extraction radius at different time is determined according to a gas pressure distribution rule and the maximum allowance gas pressure in the flow field, and then the relation between the effective extraction radius of the drill hole and the pre-extraction time is obtained. The measurement method provides a basis for design of the extraction drill hole, and improves the effect of gas extraction of the coal bed.

The invention provides a method and a system for measuring high-temperature corrosion characteristics of a boiler. The method comprises the following steps: establishing a calculation model for simulating combustion conditions of the boiler; selecting a calculation domain according to structural characteristics of the boiler, performing mesh generation on the calculation domain to obtain a mesh model of the boiler, and setting initial boundary conditions of the mesh model; simulating the combustion process of the boiler under each working condition according to the calculation module and the mesh model of which the initial boundary conditions are set; measuring the speed and temperature distribution information of each combustor in the boiler and distribution information of O2 and CO which correspond to each combustor under various working conditions in the simulated combustion process, and thus obtaining parameters which reflect the corrosion characteristics of the boiler under various loads. According to the scheme, the measurement difficulty can be reduced, the measurement cost is reduced, the measurement period is shortened, and guidance is provided for boiler transformation.

The invention discloses a touch screen which comprises a touch panel, a measuring circuit, a control circuit, at least two mechanical sensors. The touch screen is connected with a computer with a display screen or a device with a computer arranged inside. The mechanical sensors are connected with the touch panel via a mechanism. The positions of contact points on the mechanical sensors are determined by the relative values of contact pressures thereon, and can change the display contents of the computer or computer-loaded device. The inventive touch screen is implemented by only measuring the relative value of contact pressure on each mechanical sensor with less measurement difficulty and low cost. The measurement of relative value of contact pressure is insensitive to the change in environmental temperature and humidity and has no interference from the external sound, light and electricity factors. The inventive touch screen is almost a positioning input device without environmental influences.

A roof dynamic state monitor for a comprehensive mechanization filling coal mining goaf is composed of a monitor base, a multi-level telescopic rod and an underframe. The monitor base is composed of a base cylinder, a spring, a transmission cable, a pattern displacement meter and a guide rod, wherein a displacement meter support, a protective port, a spring support and a range limiting plate are arranged in the base cylinder, the pattern displacement meter contains a chip, the base cylinder is fixed on the underframe with screws, the spring is arranged in a clamping groove of the spring support, the pattern displacement meter is arranged in a clamping groove of the displacement meter support, the guide rod is directly connected to the pattern displacement meter, the guide rod and the pattern displacement meter are arranged in the spring in a sleeved mode, and the transmission cable is connected with the chip. The multi-level telescopic rod is composed of a first-level rod body, a second-level rod body and a third-level rod body, wherein the first-level rod body is installed in the base cylinder and is in direct contact with the range limiting plate on the guide rod, the second-level rod body is fixed in an installation groove of the first-level rod body through a fastening bolt, and the third-level rod body and the second-level rod body are fixed through a fixing bolt. The roof dynamic state monitor can directly and accurately monitor the dynamic subsidence of a roof and is ingenious in structure and convenient to use.

The invention provides a buoyancy tank type deepwater pile group bridge abutment construction platform and a construction method of the construction platform. The buoyancy tank type deepwater pile group bridge abutment construction platform comprises a buoyancy tank type construction platform body prefabricated according to the size of a bridge abutment and the size of pile positions, and a working platform is erected on the upper portion of the buoyancy tank type construction platform body. The buoyancy tank type construction platform body is positioned through an anchorage device. Pile holes for pile driving are preformed in the bottom face of the buoyancy tank type construction platform body, and casing pipes for pile body steel tubes to penetrate through are arranged on the pile holes and connected with the edges of the pile holes in a sealing mode. Rubber water sealing rings capable of being inflated with high pressure gas or being infused with high pressure water are arranged at the joints of the outer walls of the pile body steel tubes and the bottom portions of the corresponding pile holes. The invention further provides the construction method of the buoyancy tank type deepwater pile group bridge abutment construction platform. The buoyancy tank type deepwater pile group bridge abutment construction platform is not only used as a bridge abutment die, but also used as a platform for pile foundation operation at sea, and therefore construction difficulty is lowered, the job progress is quickened, a large number of artificial materials are saved, equipment input is reduced, and full-water-surface operation which saves time, guarantees the quality, and is efficient and safe is achieved for the buoyancy tank type construction platform.

The invention discloses a method for determining storage capacity of an open coal mine underground reservoir, and the method comprises the steps of: (1) collecting length L1 and width of W1 of the upper bottom, length L2 and width W2 of the lower bottom and height H of the open coal mine underground reservoir, and calculating the space volume V1 of the open coal mine underground reservoir; (2) collecting mass m and density rho of backfill materials in the open coal mine underground reservoir, and calculating the volume V2 of the backfill materials; (3) collecting area s and thickness h1 of a purifying and filtering layer of the open coal mine underground reservoir, and calculating the volume V3 of the purifying and filtering layer; (4) collecting thickness h2 of a waterproof layer of the open coal mine underground reservoir, and calculating the volume V4 of the waterproof layer; and (5) calculating the storage capacity V of the open coal mine underground reservoir. By adopting the method, the traditional complicated measuring operation of the underground reservoir is simplified, the measurement difficulty of the storage capacity of the open coal mine underground reservoir is reduced, the labor cost is saved and the data support is provided for storage capacity monitoring and water resource distribution at the same time.

Disclosed is a technical method for measuring the height of a live standing tree and a diameter of the tree at any tree height position by using a robot. The method comprises that the tree-climbing type robot is introduced under the condition that a target tree is shielded, the robot sends a signal to a ground receiver on the treetop, then the tree height is measured, coordinates of four points of a tree trunk surface are measured at the position of the same height in the descending process of the robot, and then any diameter of the live standing tree is further calculated. The robot which is a novel high-tech result is introduced into the measurement of the tree height, the robot is flexible and convenient to operate, the height of the live standing tree and the diameter of the tree at any tree height position are measured, the diameter at any position of the live standing tree can be measured conveniently and accurately, and relative data are provided for accurate measurement of live standing tree stock volume. According to the method, measurement errors due to various natural environments and weather factors are overcome, and the working amount and the measuring difficulty of measuring workers are greatly reduced.

The invention discloses a physical experiment and numerical simulation combined method for predicting metal extrusion forming cracking. The method comprises the steps that first, a hot-stretch test isperformed on metal, and then a Normalized Cockcroft&Latham damage model is selected for calculation to obtain a critical damage value of the metal; second, simulated verification is performed on thecritical damage value of the metal; and third, the critical damage value of the metal after simulated verification is embedded into a metal extrusion finite element model, and the cracking phenomenonin the metal extrusion forming process is predicted. According to the method, a physical experiment and simulated verification are combined to acquire the reliable critical damage value of the metal,then the positions and shapes of metal surface and internal cracks generated in multiple extrusion forming processes are predicted through numerical simulation of the extrusion processes, an error caused by a test mistake is avoided, prediction precision is improved, the prediction range is expanded, therefore, crack generation is avoided, and the quality of metal extrusion pieces is improved.

The invention discloses a measuring method for potential of a long straight wire. Only three one-dimensional electric field sensors need to be arranged along a straight line, so that sensitive directions of various electric fields are ensured to be collinear with the straight line, and the straight line is not parallel to a long straight wire to be tested; the electric field intensity generated bythe long straight wire to be tested in the electric field sensitive directions of the three one-dimensional electric field sensors and the relative distance between the three one-dimensional electricfield sensors are obtained respectively, then a potential value of the long straight wire to be tested can be calculated; compared with the prior art, the one-dimensional electric field sensors do not need a heavy iron core or a magnetic core, do not need to be connected to the long straight wire to be tested, and a plurality of one-dimensional electric field sensors are adopted; and the positionbetween the one-dimensional electric field sensors and the long straight wire to be tested is not needed to be fixed, so that the requirement for the testing position is greatly reduced, the measuring difficulty is not only reduced, but also the measuring accuracy is improved. The invention further provides a measuring device and a measuring system for the potential of the long straight wire, which also have the above beneficial effect.

The invention relates to a tool and method for matching a circular ring with a transitional ring at the bottom of a rocket storage box and belongs to the technical field of rocket storage box bottom welding. The method is good in adaptability to perimeter errors generated after a part product is welded; the mutual latitude matching relation between the small-end perimeter dimension of the variablecross-section transitional ring and the large-end perimeter dimension of the circular ring can be converted into the longitude relation to be matched, and in other words, the milling and cutting height of the large end of the circular ring is determined through assembling of the small end of the transitional ring; the variable cross-section perimeter dimension which is not convenient to measure is converted into the height dimension which is convenient to measure; measurement difficulty is lowered; and measurement precision is improved. High-precision assembling of the perimeter dimension ofa circular seam of the transitional ring is achieved; matching consistency of perimeter dimensions of two parts is guaranteed; and guarantee is provided for efficient assembling and subsequent high-quality welding of the circular seam of the transitional ring.

The invention relates to a secondary reflector surface type detection method based on three-dimensional measurement and coordinate system conversion. The method includes the steps of dividing a secondary reflection tower into three sectors, arranging three common fixed targets respectively in the three sectors, drilling a pile on the ground below the center of each sector, installing a rotatable target on the top of the pile to serve as a common fixed target, testing mirror surface to be tested only after a target is attached to the mirror surface, measuring the target points in the same sector are measured, fusing the coordinates of all the aperture measuring points to a local coordinate system of the same sector after the measurement is completed under all the apertures in the same sector, transferring the local coordinate system of the sector to the world coordinate system, and finally carrying out error analysis through the curved surface fitting. The method belongs to active measurement, the requirement for the environment is low, and large-size object measurement can be realized. The multi-aperture measurement of an object can be realized, so that all points on the surface ofthe object to be measured can achieve optimal measurement.

The invention relates to the technical field of intelligent decision making, and discloses a BMI evaluation method, which comprises the following steps: collecting sample face image data, the sample face image data comprising a BMI value; training the sample face image data by adopting a convolutional neural network to obtain a training model; obtaining a to-be-detected face image, positioning face key feature points of the to-be-detected face image, and obtaining face key points; performing face contour extraction according to the face key points to obtain a face contour; performing equal-proportion stretching on the face contour according to a perspective view angle to obtain a preprocessed face image; and performing category prediction on the preprocessed face image according to the training model to obtain an evaluation BMI value of the face image to be detected. The invention further provides a BMI evaluation device and a computer readable storage medium. According to the invention, the BMI value can be rapidly detected in real time, and the BMI measurement difficulty of a measurer is reduced.

A bearing load online monitoring method based on an eddy current displacement sensor comprises the steps of firstly, arranging the eddy current displacement sensor on a widened bearing inner ring, andmonitoring radial, axial and angular static displacement s of a bearing under different loads and rotating speeds; then constructing a quasi-static model of a bearing: K (alpha).s=F; analyzing an influence degree of a bearing design parameter K(alpha) on a bearing displacement by applying finite element simulation software, and screening out a design parameter alpha T with a greater influence; obtaining an error between an experiment result and a simulation result by utilizing a calculation method, and further correcting the design parameter alpha T with a relatively large error mean value; and finally, constructing an association model by applying a graph neural network method, and identifying the contact state of the bearing by utilizing a deep learning algorithm to realize online monitoring and evaluation of the precision of the load monitoring model under a bearing operation condition so as to judge whether the load displacement relationship of the bearing needs to be calibrated again.

The invention relates to the technical field of expansion joint detection devices, in particular to an expansion joint tensile test device which comprises a mounting base. An expansion joint is arranged at the upper end of the mounting base, pipe openings are fixedly connected to the left end and the right end of the expansion joint, and frame bodies are fixedly connected to the left end and the right end of the mounting base. A mounting plate is fixedly connected between the two frame bodies, a slotted hole is dug in the upper end of the mounting plate, elastic pieces are fixedly connected tothe inner walls of the ends, close to each other, of the two frame bodies, rectangular plates are fixedly connected to the ends, close to the expansion joint, of the elastic pieces, and clamping plates are fixedly connected to the rectangular plates. The clamping plates are matched with the pipe openings in shape, side rods are hinged to the upper ends of the rectangular plates through second hinges, the two side rods are rotationally connected through first hinges, sliding rods are fixedly connected to the upper ends of the first hinges, and the sliding rods are connected with the slotted holes in a sliding mode.

The invention discloses a geological profile measuring device and belongs to the geological measuring device field. The geological profile measuring device is equipped with a compass used for measuring an azimuth and a variable-resistance-type angle-distance measuring meter used for measuring a gradient angle and distance. The variable-resistance-type angle-distance measuring meter comprises a spiral resistor and an arc-shaped resistor which are arranged to be concentric. The arc-shaped resistor is in rotatably assembled on a measuring rod through an insulating swing rod with an inner side being connected with a mandrel vertically and is equipped with a heavy bob in a suspension manner. A conductive slip ring sleeves the arc-shaped resistor in a sliding manner. The outer end of the spiral resistor goes through the conductive slip ring. Displayers are connected between the conductive slip ring and the inner end of the spiral resistor and between the conductive slip ring and one end of the arc-shaped resistor through signal collection processors used for receiving current signals caused by resistance change. The geological profile measuring device is simple in structure and is convenient to use, the measuring precision is raised, the working progress is accelerated, and the working strength of measurement personnel is lowered.

The invention discloses a reverse deconstruction method of a product based on three-dimensional scanning, comprising the following steps: S1, placing the product on a rotary table; S2, determining a scanning standard of the product and fixing a plurality of mark points on the surface of the product; 3, performing following operations that that rotary table rotate through a set angle from rest every predetermine time while scanning the surface of the product with a depth scanner to obtain a point cloud data set compose of the surface data of the product, wherein the set angle is a center anglebetween a mark point currently facing the depth scanner and a next mark point; 4, importing that point cloud data set into the Imageware software for point cloud processing; S5: importing The data processed by S3 into the three-dimensional software, and carrying out reverse modeling to obtain the three-dimensional model of the product. The invention can deconstruct the structure of the existing product, quickly and accurately obtain a three-dimensional design model of the product, and ensures the accuracy of the three-dimensional design model.

The invention discloses a multi-surface shape measurement method based on frequency blind estimation, which comprises the following steps of: acquiring an interferogram by using a wavelength phase-shifting interferometer, and accurately solving and matching corresponding signal frequency characteristics through blind estimation of each surface interference frequency in the multi-surface interferogram; and substituting the solved interference frequency of each signal into the constructed novel least square solving equation to solve the amplitude and initial phase of each interference signal ofthe measured piece, thereby completing the multi-surface interference measurement of the transparent parallel plate. The measurement method is low in cost, avoids measurement of the average thicknessof the measured piece, and can accurately solve the contrast of each surface of the measured piece.

The invention relates to the technical field of work piece flatness detection, in particular to a work piece flatness detection device based on die machining. Four work piece auxiliary clamping partswhich are oppositely distributed in the front-back direction and the left-right direction are arranged on the upper surface of a horizontal table. Two horizontally-symmetrical guide rails are arrangedabove the horizontal table, the two ends of the two guide rails are fixed to the horizontal table through supporting columns, and the two guide rails are sleeved with sliding sleeves. The work pieceflatness detection device is novel in design and simple in structure. Flatness measurement can be carried out on a planar work piece and an arched-surface work piece. The measurement difficulty is reduced, and the precision of measurement data is improved. The problem that it is inconvenient to measure large-area and arched-surface work pieces through a leveling instrument traditionally is solved.A to-be-detected work piece is limited and fixed through the work piece auxiliary clamping parts, the problem that detection data is inaccurate due to movement of the work piece in the detection process is solved, and the practicability of the equipment is improved.

A radial gate opening degree calculation method comprises the following steps that step S1, a circle O2 is made with the fulcrum as the center and the length of a lifting rope as the radius R2; step S2, a circle O1 is made with the supporting hinge as the center and the length of the supporting arm as the radius R1; step S3, a rectangular plane coordinate system Oxy is established with the supporting hinge as the original point; step S4, the circle center coordinate of O1 is set as (0, 0), the circle center coordinate of O2 is set as (x0, y0), x0 is the horizontal distance from the fulcrum tothe supporting hinge, and y0 is the vertical distance from the fulcrum to the supporting hinge; step S5, the circle O1 and the circle O2 are intersected at two points p and q, wherein the position where the point p is located is a lifting point; step S6, the angle value of the point p on the circle O1 is set to be alfa, wherein the angle pos is beta; step S7, the distance between the supporting hinge and the s point at the bottom of the arc-shaped gate leaf is set to be R3; step S8: R1, R2, R3, x0 and y0 can be measured by a tape; and step S9, solving an s point coordinate value. Real-time, rapid, accurate and convenient data calculation is adopted, and the data measurement difficulty is reduced as much as possible.